@Book{Kernighan+Ritchie,
 author    = "Brian W. Kernighan And Dennis M. Ritchie",
 title     = "El Lenguaje de Programaci\'on C",
 publisher = "Prentice Hall",
 year      =  1995,
 edition   = "2da,",
}
@Misc{latex,
title  = {Latex guide},
note={\url{http://en.wikibooks.org/wiki/LaTeX}}
}
